9a-Methyl-4,5,5a,8,9,9a-hexahydro-furo[3,4-f]chromen-7-one

4,5,7,8,9,9a-hexahydro-6,9a-dimethylnaphtho<1,2-c>furan-7-one

5a-Methyl-3,4,6,7-tetrahydro-5aH-naphtho[1,8-bc]furan-5,8-dione

1-(4,5,6,7-tetrahydro-4-methyl-5-oxoisobenzofuranyl)-3-pentanone

5a-methyl-3,4,6,7-tetrahydrospiro[naphtho[1,8-bc]furan-5,2'-[1,3]dithian]-8(5aH)-one